Ultra-thin planar magnetic film full-frequency speaker

Abstract

An ultra-thin planar magnetic film full-frequency speaker comprises a vibration system, a magnetic system, a frame, and an acoustic foam. The vibration system and the magnetic system are received and fixed in the interior of the frame. The vibration system comprises a vibration film and a planar voice coil, the vibration film forming a contiguous inward recess structure in the middle thereof, the planar voice coil being provided with a bar-like aperture, and the planar voice coil being adhered and fixed to the vibration film The magnetic system comprises a U-shaped soft iron and a bar-shaped magnet, the bar-shaped magnet being disposed above the U-shaped soft iron and disposed beneath the bar-shaped aperture, the U-shaped soft iron being connected to the frame by means of injection molding, and the acoustic foam being adhered to a bottom face of the U-shaped soft iron.

What is claimed: 
     
       1. An ultra-thin planar magnetic film full-frequency speaker, characterized in that, it comprises: a vibration system, a magnetic system, a frame, and an acoustic foam; wherein the vibration system and the magnetic system are received and fixed in the interior of the frame;
 the vibration system comprises a vibration film and a planar voice coil, the vibration film forming a contiguous inward recess structure in the middle thereof, the planar voice coil being extended around a bar shaped aperture, and the planar voice coil being adhered and fixed to the vibration film; and 
 the magnetic system comprises a U-shaped soft iron and a bar-shaped magnet, the bar-shaped magnet being disposed above the U-shaped soft iron and disposed beneath the bar-shaped aperture, the U-shaped soft iron being connected to the frame by means of injection molding, and the acoustic foam being adhered to a bottom face of the U-shaped soft iron. 
 
     
     
       2. The ultra-thin planar magnetic film full-frequency speaker according to  claim 1 , wherein the vibration film comprises a vibration plate and an edge surrounding the vibration plate, the vibration film being fixed and connected to the edge by means of bonding or in-mold injection molding, and the vibration film being adhered and fixed to the frame by means of the edge. 
     
     
       3. The ultra-thin planar magnetic film full-frequency speaker according to  claim 2 , wherein the vibration plate downwardly forms a contiguous square groove, and the vibration plate has a square wave form-shaped section. 
     
     
       4. The ultra-thin planar magnetic film full-frequency speaker according to  claim 3 , wherein the vibration plate is made from an aluminum magnesium alloy or a plastic polymer material, and the vibration plate is additionally provided with a reinforcing rib. 
     
     
       5. The ultra-thin planar magnetic film full-frequency speaker according to  claim 2 , wherein the edge is downwardly recessed to form an inner R-shaped structure, or upwardly protrudes to form an outer R-shaped structure, or upwardly protrudes twice to form a double-outer R-shaped structure, or consecutively upwardly protrudes to form a W-shaped structure; and the edge is made from a rubber material or a polyurethane material or a silk material, and the edge is additionally provided with a reinforcing rib. 
     
     
       6. The ultra-thin planar magnetic film full-frequency speaker according to  claim 1 , wherein the planar voice coil comprises a conductive coil and a planar thin film, the conductive coil being printed on the planar thin film, and the bar-shaped aperture being provided in the planar thin film. 
     
     
       7. The ultra-thin planar magnetic film full-frequency speaker according to  claim 6 , wherein the conductive coil comprises a linear coil portion and a bent coil portion, the linear coil portion being adhered and fixed to a contiguous square groove, and the bent coil portion being adhered to two sides of the vibration film. 
     
     
       8. The ultra-thin planar magnetic film full-frequency speaker according to  claim 1 , wherein the bottom of the U-shaped soft iron is provided with a vent hole, the acoustic foam being adhered to the vent hole. 
     
     
       9. The ultra-thin planar magnetic film full-frequency speaker according to  claim 1 , wherein the bar-shaped magnet is a rectangular neodymium magnet, and each bar-shaped magnet is formed of three small square magnets. 
     
     
       10. The ultra-thin planar magnetic film full-frequency speaker according to  claim 1 , wherein the ultra-thin planar magnetic film full-frequency speaker has an integral thickness of not greater than 8 mm.